An extended note on the comparison-optimal dual-pivot quickselect

This article was published on 16. January 2017, 2017 Proceedings of the Fourteenth Workshop on Analytic Algorithmics and Combinatorics (ANALCO), SIAM, 2017, pp. 115–123.
(history:
submitted on 18. July 2016, accepted on 04. October 2016, published on 16. January 2017)